PO Currency - Buyer or Supplier?

Good morning folks, I am involved in a multi-country procurement transformation for an organization. Currently we are issuing PO's in supplier currency. However the finance team has asked us to explore the possibility of issuing PO's in their local(plant) currency. I want to understand pros and cons of this decision and what are the recommended best practices. Any links to blogs/povs will be highly beneficial. Regards, Shubham